Cycles render speed: how to optimise GPU rendering?
Samples:
2000 is far to many samples for a &quot;(not to complex)&quot; render. I would use 100 for previews, and 200-400 for final renders (depending on the complexity of your scene). Images involving lots of glass, complex shadows, indoor scenes, or depth of field may need more samples.
Tile Size:
Do some tests with your specific hardware, but, generally smaller tile size is faster for CPU, bigger tile size is faster for GPU.
An alternative to increasing samples for less noisy renders is to try some of the techniques mentioned here: How to reduce fireflies in Cycles?